Answers26-27 WHS-Chemistry-1stSixWeeksThe History and Arrangement of the Periodic Table

The History and Arrangement of the Periodic Table — Unit test Answers

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Which of the following observations would indicate that a material is a pure substance?

A
It does not dissolve in water.
B
It changes color after heating.
C
It cannot be physically broken down into different types of atoms.
D
It can be physically broken down into different types of molecules.
2
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Which best describes the trends in electronegativity on the periodic table?

A
Electronegativity increases up and to the right.
B
Electronegativity increases down and to the left.
C
Electronegativity decreases up and to the left.
D
Electronegativity decreases down and to the right.
3

What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium (K), and rubidium (Rb)?

A
Rb > K > Na > Li
B
K > Rb > Na > Li
C
Li > Na > K > Rb
D
Rb > K > Li > Na
4

Who reported four “element” classifications, but included some substances that were combinations of elements rather than true elements in his listing?

A
Henry Moseley
B
Dmitri Mendeleev
C
Antoine Lavoisier
D
Johann Dobereiner
5

Which statement describes heterogeneous mixtures?

A
They are made up of two or more pure substances that are not chemically bonded together and appear non-uniform.
B
The substances they are composed of can only be separated chemically.
C
The substances they are composed of have fixed ratios between their components.
D
They are made up of two or more pure substances that are chemically bonded together and appear uniform.
6

Which property would xenon most likely have?

A
It is stable.
B
It is a solid.
C
It is flammable.
D
It is silver in color.
7

A piece of sodium metal can be described as

A
a pure substance and a compound.
B
an impure substance that is reactive.
C
an impure substance that is unreactive.
D
a pure substance and an element.
8

Which is most likely true about electronegativity?

A
It tends to be the same across a period.
B
It tends to be the same down a group.
C
It tends to increase across a period.
D
It tends to increase down a group.
9

Which physical method can separate a mixture of steel ball bearings and marbles?

A
boiling
B
evaporation
C
filtration
D
sorting
10

What was Johann Dobereiner’s contribution to the development of the periodic table?

A
He arranged the elements according to increasing atomic mass.
B
He arranged the elements according to increasing atomic number.
C
He identified triads of elements that had similar properties.
D
He organized elements into four groups based on their properties.
11

The symbol for xenon (Xe) would be a part of the noble gas notation for the element

A
antimony.
B
cesium.
C
radium.
D
uranium.
12

What is the electron configuration for helium (He)?

A
1s1
B
1s2
C
1s22s1
D
1s22s2
13

Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to write out?

A
a set of quantum numbers for the last electron in the atom
B
a configuration with numbers, letters, and superscripts
C
a dot structure of the atom
D
an orbital notation of the atom
14

Which shows the electron configuration for Silicon (Si)?

A
[Ar]4s23d104p4
B
[Ar]3d14s2
C
[Ne]3s23p4
D
[Ne]3s23p2
15

Which is a set of valid quantum numbers?

A
n = 4, l = 4, m = 4
B
n = 1, l = –2, m = 0
C
n = –1, l = 0, m = 0
D
n = 4, l = 3, m = 3

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